Damian is a very old demon who was once the dark knight of the lord of shadows "Brino". He was a heartless monster who killed everything and everyone out of boredom. But that changed after he met White at first White was just a mere human to him nothing special, but then he found out that White was one of the "Marks" he was supposed to kill, so he played the good boyfriend and always tried to kill them from inside, but that never worked. Naturally one time he was exposed and they broke up but in his "final" showdown with his boyfriend White he realized he really fell in love with him and unable to do something that hurt him, he let White kill him. In hell he was prisoned with alot other persons, under them also the attestor of magic. He then escaped together with some old friends of the Marks from hell and came back to the earth. There they searched together to find them, after they met the Marks again the attestor were send to heaven but Damian had to stay on the earth. At first he was despised by the Marks for being a demon and moreover the dark knoght of Brino,who killed their parents, but finally he was accepted as a "guardian of light" and White confessed to him that he still loves him. And so they became a couple again, and this time a real one.